1 / 11

Field Dependence of Diamagnetic Shielding Fraction with Carrier Concentration in HTSCs

Field Dependence of Diamagnetic Shielding Fraction with Carrier Concentration in HTSCs. P.M. Grant , W.Y. Lee, A. Nazzal (IBM Almaden Research Center), M.E. López-Morales (IIM-UNAM). WC25.03: 14:24 24 March 1999. HTSC Phase Diagram. La 2-x Sr x CuO 4- Coherence Ellipsoid.  La • Cu

amity
Download Presentation

Field Dependence of Diamagnetic Shielding Fraction with Carrier Concentration in HTSCs

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Field Dependence of Diamagnetic Shielding Fraction with Carrier Concentration in HTSCs P.M. Grant, W.Y. Lee, A. Nazzal (IBM Almaden Research Center), M.E. López-Morales (IIM-UNAM) WC25.03: 14:24 24 March 1999

  2. HTSC Phase Diagram

  3. La2-xSrxCuO4-Coherence Ellipsoid  La • Cu O ab = 20 Å c = 6 Å

  4. T T Fermi LiquidSuperconductors 0   -1/4

  5. M vs. T,HY.Ba2Cu3O7-y • IBM ARC Group Data: 16 March, 1987 • MRS Proc, April, 1987

  6. R/R100 vs. T,H,xY1-x(Pr0.7Ca0.3)xBa2Cu3O7-y

  7. (’, ”)ac vs. T,H,xY1-x(Pr0.7Ca0.3)xBa2Cu3O7-y

  8. (’, ”)ac vs. T,H,xLa2-xSrxCuO4-

  9. ac vs. T,H,yY.Ba2Cu3O7-y • Kubo, et al., PRB 37, 7858 (1988){1987}. • Early H-Field Dependence on “Carrier Concentration.”

  10. Summary • In moderate magnetic fields, low-T shielding limit complete only for highest TC carrier concentrations (a universal HTSC constant?) • For small external magnetic fields, (T0) ~ -1/4 at all carrier concentrations

  11. Conclusions • Strong evidence for granular behavior, due to either spacial or electronic inhomogeneities, at all carrier concentrations other than optimum. • Has this been the historical “smoking gun” pointing to the existence of stripe arrays in HTSCs?

More Related